package com.changgou.web.gateway.filter;

import com.changgou.web.gateway.service.AuthService;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class AuthFilter implements GlobalFilter, Ordered {

    //跳转的路径的常量
    private static final String LOGIN_URL="http://localhost:8001/api/oauth/toLogin";



    @Autowired
    private AuthService authService;







    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        //获取到请求对象
        ServerHttpRequest request = exchange.getRequest();
        //获取到相应对象
        ServerHttpResponse response = exchange.getResponse();



        //                                                                                      路径优化

        //1.判断请求路径是否为登录请求，如果是，则直接放行
        String path = request.getURI().getPath();

        if ("/api/oauth/login".equals(path)|| !UrlFilter.hasAuthorize(path)){
            //直接放行
            return chain.filter(exchange);
        }


        //2.从cookie中获取jti的值，如果该值不存在，拒绝本次访问
        String jti =authService.getJtiFromCookie(request);

        if (StringUtils.isEmpty(jti)){
            //拒绝访问
            /*response.setStatusCode(HttpStatus.UNAUTHORIZED);

            return response.setComplete();*/


            //跳转登录页面
            return this.toLoginPage(LOGIN_URL+"?FROM="+request.getURI().getPath(),exchange);




        }

        //3.从redis中获取jwt的值，如果该值不存在，拒绝本次访问
       String jwt= authService.getJtiFromRedis(jti);
        if (StringUtils.isEmpty(jwt)){

            //不存在 拒绝访问
          /*  response.setStatusCode(HttpStatus.UNAUTHORIZED);

            return response.setComplete();*/

          return this.toLoginPage(LOGIN_URL,exchange);
        }

        //4.对当前的请求对象进行增强，让他回血袋令牌的信息

        //增强头信息
        request.mutate().header("Authorization","Bearer "+jwt);



        return chain.filter(exchange);
    }

    /**
     *      跳转登录页面
     * @param loginUrl
     * @param exchange
     * @return
     */
    private Mono<Void> toLoginPage(String loginUrl, ServerWebExchange exchange) {
        //获取相应对象
        ServerHttpResponse response = exchange.getResponse();

        //设置状态码
        //SEE_OTHER  状态是303  跳转
        response.setStatusCode(HttpStatus.SEE_OTHER);
        //设置头信息
        response.getHeaders().set("Location",loginUrl);

        return response.setComplete();

    }


    //过滤器的执行优先级
    @Override
    public int getOrder() {
        return 0;
    }
}
